<html>
<head>
<script>
function replacestyles(){
document.getElementById('a').setAttribute('style', 'border: 1px solid black; -moz-border-radius: 2em;');
document.body.offsetHeight; 
}
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<div id="a">
<pre style="overflow: -moz-hidden-unscrollable;">


text



</pre>
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</body>
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